Discozantaena

Perkins, Philip D., 2005, A revision of the South African endemic humicolous beetle genus Discozantaena Perkins and Balfour­Browne (Coleoptera: Hydraenidae), Zootaxa 915, pp. 1-48 : 6-7

Key to Species of Discozantaena

1. Elytral margin not widely explanate; clypeus not widened laterally, not shelf­like ( Fig.1 ) ............................................................................................................ sequentia n. sp.

­ Elytral margin widely explanate; clypeus widened at anterior angles, shelf­like ......... 2

2. Anterior margin of clypeus straight............................................................................... 3

­ Anterior margin of clypeus emarginate......................................................................... 5

3. Pronotal disc with granules much denser in impressions than on shining relief ( Fig. 3 ) ................................................................................................ drakensbergensis n. sp.

­ Pronotal discal relief more markedly granulate ............................................................ 4

4. Body form broader, pronotum width/length ratio ca. 1.90 ( Fig. 8 ). .......... ovata n. sp.

­ Body form less broad, pronotum width/length ratio ca 1.76 ( Fig. 2 )... endroedyi n. sp.

5. Sides of pronotum straight ........................................................................................... 6

­ Sides of pronotum arcuate............................................................................................. 8

6. Pronotum on each side with large, moderately convex non­granulate area ( Fig. 9 ) ...... ................................................................................................................. tibiovela n. sp.

­ Pronotum on each side more uniformly granulate ........................................................ 7

7. Pronotum more transverse, width/length ratio ca. 1.79; body smaller, length ca. 1.71 mm; explanate margin of elytra narrower ( Fig. 5 ) .............................. brevicollis n. sp.

­ Pronotum less transverse, width/length ratio ca. 1.90; body larger, length ca. 2.05 mm; explanate margin of elytra very wide ( Fig. 6 )............................................. galea n. sp.

8. Frons disc with granules absent or very fine and very sparse; body larger, length ca. 2.03 mm ( Fig. 7 )........................................................................................ karroo n. sp.

­ Frons disc with distinct granules; body smaller, length ca. 1.80 mm or less ................ 9

9. Elytra shorter, elytra length/pronotum length ratio ca. 2.44; elytra very acuminate posteriorly and markedly peaked at suture ( Fig. 11 ) ...................................... sepiola n. sp.

­ Elytra longer, elytra length/pronotum length ratio ca. 2.70 or greater; elytra not markedly acuminate posteriorly, less peaked at suture ...................................................... 10

10. Elytral humeri present; aedeagus as illustrated ( Figs. 4 , 15 ) .......................................... ...................................................................... genuvela Perkins and Balfour­Browne

­ Elytral humeri absent; aedeagus as illustrated ( Figs. 10 , 21 ).................... leleupi n. sp.

Figures

FIGURE 1. Discozantaena sequentia holotype. Dorsal and lateral habitus.

FIGURE 2. Discozantaena endroedyi holotype. Dorsal and lateral habitus.

FIGURE 3. Discozantaena drakensbergensis holotype. Dorsal and lateral habitus.

FIGURE 4. Discozantaena genuvela holotype. Dorsal and lateral habitus.

FIGURE 5. Discozantaena brevicollis holotype. Dorsal and lateral habitus.

FIGURE 6. Discozantaena galea holotype. Dorsal and lateral habitus.

FIGURE 7. Discozantaena karroo holotype. Dorsal and lateral habitus.

FIGURE 8. Discozantaena ovata holotype. Dorsal and lateral habitus.

FIGURE 9. Discozantaena tibiovela holotype. Dorsal and lateral habitus.

FIGURE 10. Discozantaena leleupi holotype. Dorsal and lateral habitus.

FIGURE 11. Discozantaena sepiola holotype. Dorsal and lateral habitus.

FIGURE 15. Discozantaena genuvela. Aedeagus of holotype.

FIGURE 21. Discozantaena leleupi. Aedeagus of holotype.